Malicious PDF — malware analysis report

Static analysis result for SHA-256 516fa3aee0b1ab93…

MALICIOUS

PDF

81.4 KB Created: 2021-09-03 22:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dfc35da1f03dc1764395b64cb90fdbe8 SHA-1: 60d13116cf5e2dfebbc8aa53a2a2d92d49e66e97 SHA-256: 516fa3aee0b1ab93abb6d727dfece48999859113b20b17c334155ee09c6f1335
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites and disposable hosting, likely to lure users into clicking through. The presence of multiple PDF link farm heuristics and the use of compromised CMS upload storage strongly suggest a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8c85fa0e5a9b75af0ebb2ce1ada7257a/1366301135.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc444d85b21---93884720025.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/xazimajusoninilawuve.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a574c0a38---72755676320.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/jegafisumupega.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/35792652885.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/gavivij.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/29035997800.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfe9d430df---misarepenagixibu.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/94259055071.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4ad52e1fa---jinolisusulasavisujavox.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/93106086950.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/52687692903.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7dfd0179a---jegowirutimosegalarowizot.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/5954204464.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/17312778015.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa596bbfdf---29912580293.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/45071119626.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161193fffd6d4c---74539509465.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719d7a8905e---78482008240.pdfIn PDF document text
    • http://pi-consulting.ch/download/momularanudotumuviluzeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=introduction+to+nonlinear+dynamics+for+physicists+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 11052 bytes
SHA-256: 8a923887c83b08edc2d7cfd5ae97d1e8f66224f34dd6e592f8226d0cf1dc5d6d
font_01_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 18480 bytes
SHA-256: 71339e4aa9488e6aa84ba949aea1cc722ae5ab69b373bb36c46ab34c08afbe98
font_02_sfnt_off00011f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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